"Only Girl (In the World)" is a song by Barbadian singer Rihanna from her fifth album, Loud (2010).
The album's lead single, it was released on September 10.
Crystal Johnson wrote the song in collaboration with producers Stargate and Sandy Vee.
"Only Girl (In the World)" was the first song composed for the album, and the singer decided to include it on the track list before she recorded her vocals.
Backed by strong bass and synthesizer, it is a euro-dance song that incorporates elements of hi-NRG, rave and R&B in its composition.